永磁铁氧体元件机械强度分析

MECHANICAL STRENGTH ANALYSIS OF PERMANENT MAGNET COMPONENTS

针对永磁铁氧体元件机械强度问题,用压力试验机测试产品的承受负荷极限,用扫描电子显微镜观察样品的断面形貌,对永磁铁氧体元件预烧、细粉碎、烧结等生产环节做了对比实验,实验结果显示,预烧前按质量分数计,添加0.10%~0.20%的Zr O2,在氧含量为9%~10%,于1 290℃~1 310℃保温2 h的条件下预烧,细粉碎时料浆粒度分布优良、烧结时在永磁铁氧体元件收缩最厉害的温区内（即1 050℃~1 200℃）缓慢升温（如8℃/min）,在最高烧结温区的温度稳定并有效受控,均有利于永磁铁氧体元件显微结构、磁性能及其承受负荷极限能力的改善。

As for the mechanical strength of permanent magnet components,the researchers used the pressure testing machine to test the load limit of the products and observed the samples of the fracture surface with the scanning electron microscope. Then the researchers conducted comparative experiments on the permanent magnet components in the process of the pre-sintering,fine grinding and sintering,etc. The results show that Zr O2 should be added at 0. 10% ~ 0. 20% with oxygen content at 9% ~ 10% and pre-sintering temperature at 1 290 ℃ ~ 1 310 ℃ for 2-hour preservation. Besides,the particle size of the slurry should be well distributed at the fine-grinding stage. In particular,the temperatures of permanent magnet components should increase slowly within the most-shrinkage temperature range（ i. e. 1 050 ~ 1 200 ℃） and be stably and effectively controlled at the highest sintering temperature area. All these requirements are conducive to the improvement of permanent magnet components in the respect of their microscopic structures,magnetic properties and load limit.